var-200912-0321
Vulnerability from variot
Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp, (2) .cer, or (3) .asa first extension, followed by a semicolon and a safe extension, as demonstrated by the use of asp.dll to handle a .asp;.jpg file. Microsoft IIS is prone to a security-bypass vulnerability. This vulnerability may cause IIS to interpret unexpected files as CGI applications. Attackers may be able to exploit this vulnerability to bypass intended security restrictions. UPDATE (December 25, 2009): Reports indicate that IIS 7.5 is not vulnerable to this issue. Furthermore, it is currently unknown whether IIS 7.0 is vulnerable. UPDATE (December 29, 2009): Reports indicate that IIS 5.0 SP1 under Windows XP SP 3 and IIS 7.0 under Windows Server 2008 are not affected. NOTE: This BID is being retired. For an exploit to succeed, IIS must be configured in a nondefault way and contrary to the vendor's recommended best practices. ----------------------------------------------------------------------
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TITLE: Microsoft IIS ASP Multiple Extensions Security Bypass
SECUNIA ADVISORY ID: SA37831
VERIFY ADVISORY: http://secunia.com/advisories/37831/
DESCRIPTION: Soroush Dalili has discovered a vulnerability in Microsoft Internet Information Services (IIS), which can be exploited by malicious people to potentially bypass certain security restrictions and compromise a vulnerable system.
The vulnerability is caused due to the web server incorrectly executing e.g. ASP code included in a file having multiple extensions separated by ";", only one internal extension being equal to ".asp" (e.g. "file.asp;.jpg"). This can be exploited to potentially upload and execute arbitrary ASP code via a third-party application using file extensions to restrict uploaded file types.
The vulnerability is confirmed on a fully patched Windows Server 2003 R2 SP2 running Microsoft IIS version 6. Other versions may also be affected.
SOLUTION: Restrict file uploads to trusted users only.
PROVIDED AND/OR DISCOVERED BY: Soroush Dalili
ORIGINAL ADVISORY: http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/advisories/secunia_security_advisories/
Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/
Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.
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Show details on source website
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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